All my containers cannot access internet if run without '--net=host'.

Environment

• distro: Ubuntu 13.04
• docker: 1.6.2
• go: go1.4.2
• ufw: DEFAULT_FORWARD_POLICY="ACCEPT"
• 2375 port: 2375/tcp ALLOW Anywhere
• docker daemon: docker -d -H unix:///var/run/docker.sock --bip=172.17.42.1/16 -b docker0
• docker0 interface: docker0: <BROADCAST,MULTICAST> mtu 1500 qdisc noqueue state DOWN

Question

I can append --net=host manually, but kubernetes always runs the docker without it. So any dockers in pods cannot pull images. What's worse, the Guestbook example failed either with the error connection refused, even add x.x.x.x redis-master in /etc/hosts of slaves.

So is there a way to use host mode as docker daemon arg, or the kube arg?